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B. p.diagonal ruang = a akar 3
= 15 akar 3 cm
C. l.permukaan = 6a^2
= 6x(15x15)
= 1350 cm^2
D. volume = a^3
= 15x15x15
= 3375 cm^3
maap , yg A msh bingung
moga yg ini bisa membantu